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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::num_put&lt;CharT,OutputIt&gt;::</span>put, <span style="font-size:0.7em; line-height:130%">std::num_put&lt;CharT,OutputIt&gt;::</span>do_put</h1>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../messages_byname.html" title="cpp/locale/messages byname"><span class="t-lines"><span>messages_byname</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../collate_byname.html" title="cpp/locale/collate byname"><span class="t-lines"><span>collate_byname</span></span></a></div></div></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../time_get_byname.html" title="cpp/locale/time get byname"><span class="t-lines"><span>time_get_byname</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../time_put_byname.html" title="cpp/locale/time put byname"><span class="t-lines"><span>time_put_byname</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../numpunct_byname.html" title="cpp/locale/numpunct byname"><span class="t-lines"><span>numpunct_byname</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../moneypunct_byname.html" title="cpp/locale/moneypunct byname"><span class="t-lines"><span>moneypunct_byname</span></span></a></div></div></td></tr>
</table></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> 编码转换平面</td></tr>
<tr class="t-nv-col-table"><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../codecvt_utf8.html" title="cpp/locale/codecvt utf8"><span class="t-lines"><span>codecvt_utf8</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../codecvt_utf16.html" title="cpp/locale/codecvt utf16"><span class="t-lines"><span>codecvt_utf16</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../codecvt_utf8_utf16.html" title="cpp/locale/codecvt utf8 utf16"><span class="t-lines"><span>codecvt_utf8_utf16</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../codecvt_mode.html" title="cpp/locale/codecvt mode"><span class="t-lines"><span>codecvt_mode</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
</table></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> C 本地环境</td></tr>
<tr class="t-nv-col-table"><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../setlocale.html" title="cpp/locale/setlocale"><span class="t-lines"><span>setlocale</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../localeconv.html" title="cpp/locale/localeconv"><span class="t-lines"><span>localeconv</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../lconv.html" title="cpp/locale/lconv"><span class="t-lines"><span>lconv</span></span></a></div></div></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../LC_categories.html" title="cpp/locale/LC categories"><span class="t-lines"><span>LC_ALL</span><span>LC_COLLATE</span><span>LC_CTYPE</span><span>LC_MONETARY</span><span>LC_NUMERIC</span><span>LC_TIME</span></span></a></div></div></td></tr>
</table></div></td></tr>
</table></div><div></div></div></div></div><div class="t-navbar-sep"> </div><div class="t-navbar-head"><a href="../num_put.html" title="cpp/locale/num put"><tt>std::num_put</tt></a><div class="t-navbar-menu"><div><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv-h2"><td colspan="5">成员函数</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="num_put.html" title="cpp/locale/num put/num put"><span class="t-lines"><span>num_put::num_put</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="~num_put.html" title="cpp/locale/num put/~num put"><span class="t-lines"><span>num_put::~num_put</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><strong class="selflink"><span class="t-lines"><span>num_put::put</span><span>num_put::do_put</span></span></strong></div></div></td></tr>
</table></div><div></div></div></div></div><div class="t-navbar-sep"> </div></div>
<table class="t-dcl-begin"><tbody>
<tr class="t-dsc-header">
<td> <div>定义于头文件 <code><a href="../../header/locale.html" title="cpp/header/locale">&lt;locale&gt;</a></code>
 </div></td>
<td></td>
<td></td>
</tr>
</tbody>
<tbody class="t-dcl-rev t-dcl-rev-num"><tr class="t-dcl-rev-aux">
<td></td>
<td rowspan="142">(1)</td>
<td></td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">public</span><span class="sy4">:</span><br>
iter_type put<span class="br0">(</span> iter_type out, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, char_type fill, <span class="kw4">bool</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp">iter_type put<span class="br0">(</span> iter_type out, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, char_type fill, <span class="kw4">long</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td> <div><span class="mw-geshi cpp source-cpp">iter_type put<span class="br0">(</span> iter_type out, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, char_type fill, <span class="kw4">long</span> <span class="kw4">long</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-cxx11">(C++11 起)</span> </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp">iter_type put<span class="br0">(</span> iter_type out, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, char_type fill, <span class="kw4">unsigned</span> <span class="kw4">long</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td> <div><span class="mw-geshi cpp source-cpp">iter_type put<span class="br0">(</span> iter_type out, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, char_type fill, <span class="kw4">unsigned</span> <span class="kw4">long</span> <span class="kw4">long</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-cxx11">(C++11 起)</span> </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp">iter_type put<span class="br0">(</span> iter_type out, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, char_type fill, <span class="kw4">double</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp">iter_type put<span class="br0">(</span> iter_type out, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, char_type fill, <span class="kw4">long</span> <span class="kw4">double</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp">iter_type put<span class="br0">(</span> iter_type out, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, char_type fill, <span class="kw4">const</span> <span class="kw4">void</span><span class="sy2">*</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
</tbody><tbody>
</tbody>
<tbody class="t-dcl-rev t-dcl-rev-num"><tr class="t-dcl-rev-aux">
<td></td>
<td rowspan="142">(2)</td>
<td></td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">protected</span><span class="sy4">:</span><br>
<span class="kw1">virtual</span> iter_type do_put<span class="br0">(</span> iter_type out, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, char_type fill, <span class="kw4">bool</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">virtual</span> iter_type do_put<span class="br0">(</span> iter_type out, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, char_type fill, <span class="kw4">long</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">virtual</span> iter_type do_put<span class="br0">(</span> iter_type out, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, char_type fill, <span class="kw4">long</span> <span class="kw4">long</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-cxx11">(C++11 起)</span> </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">virtual</span> iter_type do_put<span class="br0">(</span> iter_type out, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, char_type fill, <span class="kw4">unsigned</span> <span class="kw4">long</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">virtual</span> iter_type do_put<span class="br0">(</span> iter_type out, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, char_type fill, <span class="kw4">unsigned</span> <span class="kw4">long</span> <span class="kw4">long</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-cxx11">(C++11 起)</span> </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">virtual</span> iter_type do_put<span class="br0">(</span> iter_type out, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, char_type fill, <span class="kw4">double</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">virtual</span> iter_type do_put<span class="br0">(</span> iter_type out, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, char_type fill, <span class="kw4">long</span> <span class="kw4">double</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">virtual</span> iter_type do_put<span class="br0">(</span> iter_type out, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> str, char_type fill, <span class="kw4">const</span> <span class="kw4">void</span><span class="sy2">*</span> v <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
</tbody><tbody>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<div class="t-li1"><span class="t-li">1)</span> 公开成员函数，调用最终导出类的受保护虚成员函数 <code>do_put</code> 。</div>
<div class="t-li1"><span class="t-li">2)</span> 写字符到输出序列 <code>out</code> ，这些字符表示 <code>v</code> 的值，按格式化标志 <span class="t-c"><span class="mw-geshi cpp source-cpp">str.<span class="me1">flags</span><span class="br0">(</span><span class="br0">)</span></span></span> 和流 <code>str</code> 中感染的 locale 的 <span class="t-lc"><a href="../numpunct.html" title="cpp/locale/numpunct">std::numpunct</a></span> 和 <span class="t-lc"><a href="../ctype.html" title="cpp/locale/ctype">std::ctype</a></span> 平面所要求者格式化。此函数为所有有格式输出流运算符，如 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../io/cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> n<span class="sy4">;</span></span></span> 所调用。</div>
<p>转换以四个阶段出现
</p>
<h4><span class="mw-headline" id=".E9.98.B6.E6.AE.B5_1_.EF.BC.9A.E8.BD.AC.E6.8D.A2.E8.AF.B4.E6.98.8E.E7.AC.A6.E9.80.89.E6.8B.A9">阶段 1 ：转换说明符选择</span></h4>
<ul><li> 获得 I/O 格式标志，如同以
</li></ul>
<dl><dd> <span class="t-c"><span class="mw-geshi cpp source-cpp">fmtflags basefield <span class="sy1">=</span> <span class="br0">(</span>str.<span class="me1">flags</span><span class="br0">(</span><span class="br0">)</span> <span class="sy3">&amp;</span> <a href="../../io/ios_base/fmtflags.html"><span class="kw1682">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">basefield</span></span></a><span class="br0">)</span><span class="sy4">;</span></span></span>
</dd><dd> <span class="t-c"><span class="mw-geshi cpp source-cpp">fmtflags uppercase <span class="sy1">=</span> <span class="br0">(</span>str.<span class="me1">flags</span><span class="br0">(</span><span class="br0">)</span> <span class="sy3">&amp;</span> <a href="../../io/ios_base/fmtflags.html"><span class="kw1696">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">uppercase</span></span></a><span class="br0">)</span><span class="sy4">;</span></span></span>
</dd><dd> <span class="t-c"><span class="mw-geshi cpp source-cpp">fmtflags floatfield <span class="sy1">=</span> <span class="br0">(</span>str.<span class="me1">flags</span><span class="br0">(</span><span class="br0">)</span> <span class="sy3">&amp;</span> <a href="../../io/ios_base/fmtflags.html"><span class="kw1689">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">floatfield</span></span></a><span class="br0">)</span><span class="sy4">;</span></span></span>
</dd><dd> <span class="t-c"><span class="mw-geshi cpp source-cpp">fmtflags showpos <span class="sy1">=</span> <span class="br0">(</span>str.<span class="me1">flags</span><span class="br0">(</span><span class="br0">)</span> <span class="sy3">&amp;</span> <a href="../../io/ios_base/fmtflags.html"><span class="kw1693">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">showpos</span></span></a><span class="br0">)</span><span class="sy4">;</span></span></span>
</dd><dd> <span class="t-c"><span class="mw-geshi cpp source-cpp">fmtflags showbase <span class="sy1">=</span> <span class="br0">(</span>str.<span class="me1">flags</span><span class="br0">(</span><span class="br0">)</span> <span class="sy3">&amp;</span> <a href="../../io/ios_base/fmtflags.html"><span class="kw1691">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">showbase</span></span></a><span class="br0">)</span><span class="sy4">;</span></span></span>
</dd><dd> <span class="t-c"><span class="mw-geshi cpp source-cpp">fmtflags showpoint <span class="sy1">=</span> <span class="br0">(</span>str.<span class="me1">flags</span><span class="br0">(</span><span class="br0">)</span> <span class="sy3">&amp;</span> <a href="../../io/ios_base/fmtflags.html"><span class="kw1692">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">showpoint</span></span></a><span class="br0">)</span><span class="sy4">;</span></span></span>
</dd></dl>
<ul><li> 若 <code>v</code> 的类型为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span></span></span>
<ul><li> 若 <span class="t-c"><span class="mw-geshi cpp source-cpp">boolalpha <span class="sy1">==</span> <span class="nu0">0</span></span></span> ，则转换 <code>v</code> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">int</span></span></span> 类型并进行整数输出。
</li><li> 若 <span class="t-c"><span class="mw-geshi cpp source-cpp">boolalpha <span class="sy3">!</span><span class="sy1">=</span> <span class="nu0">0</span></span></span> ，则若 <span class="t-c"><span class="mw-geshi cpp source-cpp">v <span class="sy1">==</span> <span class="kw2">true</span></span></span> 则获得<span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../use_facet.html"><span class="kw1897">std::<span class="me2">use_facet</span></span></a><span class="sy1">&lt;</span><a href="../numpunct.html"><span class="kw1961">std::<span class="me2">numpunct</span></span></a><span class="sy1">&lt;</span>charT<span class="sy1">&gt;&gt;</span><span class="br0">(</span>str.<span class="me1">getloc</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span>.<span class="me1">truename</span><span class="br0">(</span><span class="br0">)</span></span></span> ，或若 <span class="t-c"><span class="mw-geshi cpp source-cpp">v <span class="sy1">==</span> <span class="kw2">false</span></span></span> 则获得 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../use_facet.html"><span class="kw1897">std::<span class="me2">use_facet</span></span></a><span class="sy1">&lt;</span><a href="../numpunct.html"><span class="kw1961">std::<span class="me2">numpunct</span></span></a><span class="sy1">&lt;</span>charT<span class="sy1">&gt;&gt;</span><span class="br0">(</span>str.<span class="me1">getloc</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span>.<span class="me1">falsename</span><span class="br0">(</span><span class="br0">)</span></span></span> ，并以 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>out<span class="sy2">++</span> <span class="sy1">=</span> c</span></span> 输出该字符串的每个相继字符 <code>c</code> 到 <code>out</code> 。此情况下不进行进一步的操作，函数返回 <code>out</code> 。
</li></ul>
</li><li> 若 <code>v</code> 的类型为整数类型，则选择下列首个可应用选项：
</li></ul>
<dl><dd> 若 <span class="t-c"><span class="mw-geshi cpp source-cpp">basefield <span class="sy1">==</span> oct</span></span> ，则将使用转换说明符 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">%</span>o</span></span>
</dd><dd> 若 <span class="t-c"><span class="mw-geshi cpp source-cpp">basefield <span class="sy1">==</span> hex <span class="sy3">&amp;&amp;</span> <span class="sy3">!</span>uppercase</span></span> ，则将使用转换说明符 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">%</span>x</span></span>
</dd><dd> 若 <span class="t-c"><span class="mw-geshi cpp source-cpp">basefield <span class="sy1">==</span> hex</span></span> ，则将使用转换说明符 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">%</span>X</span></span>
</dd><dd> 若 <code>v</code> 的类型有符号，则将使用转换说明符 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">%</span>d</span></span>
</dd><dd> 若 <code>v</code> 的类型无符号，则将使用转换说明符 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">%</span>u</span></span>
</dd></dl>
<ul><li> 对于整数类型，若需要则添加长度修饰符到转换说明：对于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">long</span></span></span> 和 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">unsigned</span> <span class="kw4">long</span></span></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp">l</span></span> ，对于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">long</span> <span class="kw4">long</span></span></span> 和 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">unsigned</span> <span class="kw4">long</span> <span class="kw4">long</span></span></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp">ll</span></span> 。
</li><li> 若 <code>v</code> 为浮点类型，则选择首个可应用选项：
</li></ul>
<dl><dd> 若 <span class="t-c"><span class="mw-geshi cpp source-cpp">floatfield <span class="sy1">==</span> <a href="../../io/ios_base/fmtflags.html"><span class="kw1688">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">fixed</span></span></a></span></span> ，则将使用转换说明符 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">%</span>f</span></span>
</dd><dd> 若 <span class="t-c"><span class="mw-geshi cpp source-cpp">floatfield <span class="sy1">==</span> <a href="../../io/ios_base/fmtflags.html"><span class="kw1687">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">scientific</span></span></a> <span class="sy3">&amp;&amp;</span> <span class="sy3">!</span>uppercase</span></span> ，则将使用转换说明符 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">%</span>e</span></span>
</dd><dd> 若 <span class="t-c"><span class="mw-geshi cpp source-cpp">floatfield <span class="sy1">==</span> <a href="../../io/ios_base/fmtflags.html"><span class="kw1687">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">scientific</span></span></a></span></span> ，则将使用转换说明符 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">%</span>E</span></span>
</dd></dl>
 <table class="t-rev-begin">
<tr class="t-rev t-since-cxx11"><td>
<dl><dd> 若 <span class="t-c"><span class="mw-geshi cpp source-cpp">floatfield <span class="sy1">==</span> <span class="br0">(</span><a href="../../io/ios_base/fmtflags.html"><span class="kw1688">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">fixed</span></span></a> <span class="sy3">|</span> <a href="../../io/ios_base/fmtflags.html"><span class="kw1687">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">scientific</span></span></a><span class="br0">)</span> <span class="sy3">&amp;&amp;</span> <span class="sy3">!</span>uppercase</span></span> ，则将使用转换说明符 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">%</span>a</span></span>
</dd><dd> 若 <span class="t-c"><span class="mw-geshi cpp source-cpp">floatfield <span class="sy1">==</span> <span class="br0">(</span><a href="../../io/ios_base/fmtflags.html"><span class="kw1688">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">fixed</span></span></a> <span class="sy3">|</span> <a href="../../io/ios_base/fmtflags.html"><span class="kw1687">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">scientific</span></span></a><span class="br0">)</span></span></span> ，则将使用转换说明符 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">%</span>A</span></span>
</dd></dl>
</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td></tr>
</table>
<dl><dd> 若 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy3">!</span>uppercase</span></span> ，则将使用转换说明符 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">%</span>g</span></span>
</dd><dd> 否则，将使用转换说明符 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">%</span>G</span></span>
<ul><li> 若 <code>v</code> 的类型为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">long</span> <span class="kw4">double</span></span></span> ，则添加长度修饰符 <span class="t-c"><span class="mw-geshi cpp source-cpp">L</span></span> 到转换说明符。
</li><li> 另外<span class="t-rev-inl t-since-cxx11"><span>若 <span class="t-c"><span class="mw-geshi cpp source-cpp">floatfield <span class="sy3">!</span><span class="sy1">=</span> <span class="br0">(</span>ios_base<span class="sy4">::</span><span class="me2">fixed</span> <span class="sy3">|</span> ios_base<span class="sy4">::</span><span class="me2">scientific</span><span class="br0">)</span></span></span> 则</span> <span><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></span></span>添加设为 <span class="t-c"><span class="mw-geshi cpp source-cpp">str.<span class="me1">precision</span><span class="br0">(</span><span class="br0">)</span></span></span> 的精度说明符
</li></ul>
</dd></dl>
<ul><li> 对于整数和浮点类型，若设置了 <span class="t-c"><span class="mw-geshi cpp source-cpp">showpos</span></span> ，则前附修饰符 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">+</span></span></span> 。
</li><li> 对于整数类型，若设置了 <span class="t-c"><span class="mw-geshi cpp source-cpp">showbase</span></span> ，则前附修饰符 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="co2">#</span></span></span> 。
</li><li> 对于浮点类型，若设置了 <span class="t-c"><span class="mw-geshi cpp source-cpp">showpoint</span></span> ，则前附修饰符 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="co2">#</span></span></span> 。
</li><li> 若 <code>v</code> 的类型为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">void</span><span class="sy2">*</span></span></span> ，则将使用格式说明符 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">%</span>p</span></span> 。
</li><li> 如同以在 "C" 本地环境中调用 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../io/c/fprintf.html"><span class="kw1845">std::<span class="me2">printf</span></span></a><span class="br0">(</span>spec, v<span class="br0">)</span></span></span> 创建窄字符串，其中 <code>spec</code> 是所选的格式说明符。
</li></ul>
<h4><span class="mw-headline" id=".E9.98.B6.E6.AE.B5_2_.EF.BC.9A.E6.9C.AC.E5.9C.B0.E7.8E.AF.E5.A2.83.E9.99.90.E5.AE.9A.E8.BD.AC.E6.8D.A2">阶段 2 ：本地环境限定转换</span></h4>
<ul><li> 调用 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../use_facet.html"><span class="kw1897">std::<span class="me2">use_facet</span></span></a><span class="sy1">&lt;</span><a href="../ctype.html"><span class="kw1938">std::<span class="me2">ctype</span></span></a><span class="sy1">&lt;</span>CharT<span class="sy1">&gt;&gt;</span><span class="br0">(</span>str.<span class="me1">getloc</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span>.<span class="me1">widen</span><span class="br0">(</span>c<span class="br0">)</span></span></span> ，将阶段 1 中获得的每个异于小数点 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">'.'</span></span></span> 的字符 <code>c</code> 转换为 <code>CharT</code> 。
</li><li> 对于算术类型，按照 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../use_facet.html"><span class="kw1897">std::<span class="me2">use_facet</span></span></a><span class="sy1">&lt;</span><a href="../numpunct.html"><span class="kw1961">std::<span class="me2">numpunct</span></span></a><span class="sy1">&lt;</span>CharT<span class="sy1">&gt;&gt;</span><span class="br0">(</span>str.<span class="me1">getloc</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span>.<span class="me1">grouping</span><span class="br0">(</span><span class="br0">)</span></span></span> 所提供的分组规则，插入从 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../use_facet.html"><span class="kw1897">std::<span class="me2">use_facet</span></span></a><span class="sy1">&lt;</span><a href="../numpunct.html"><span class="kw1961">std::<span class="me2">numpunct</span></span></a><span class="sy1">&lt;</span>CharT<span class="sy1">&gt;&gt;</span><span class="br0">(</span>str.<span class="me1">getloc</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span>.<span class="me1">thousands_sep</span><span class="br0">(</span><span class="br0">)</span></span></span> 获得的千分隔字符到序列中。
</li><li> 以 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../use_facet.html"><span class="kw1897">std::<span class="me2">use_facet</span></span></a><span class="sy1">&lt;</span><a href="../numpunct.html"><span class="kw1961">std::<span class="me2">numpunct</span></span></a><span class="sy1">&lt;</span>CharT<span class="sy1">&gt;&gt;</span><span class="br0">(</span>str.<span class="me1">getloc</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span>.<span class="me1">decimal_point</span><span class="br0">(</span><span class="br0">)</span></span></span> 替换小数点字符（ <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">'.'</span></span></span> ）。
</li></ul>
<h4><span class="mw-headline" id=".E9.98.B6.E6.AE.B5_3_.EF.BC.9A.E5.A1.AB.E5.85.85">阶段 3 ：填充</span></h4>
<ul><li> 如同以 <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">fmtflags</span> adjustfield <span class="sy1">=</span> <span class="br0">(</span>flags <span class="sy3">&amp;</span> <span class="br0">(</span><a href="../../io/ios_base/fmtflags.html"><span class="kw1686">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">adjustfield</span></span></a><span class="br0">)</span><span class="br0">)</span></span></span> 获得调整标志，并以如下方式检验它以鉴别填充位置
</li></ul>
<dl><dd> 若 <span class="t-c"><span class="mw-geshi cpp source-cpp">adjustfield <span class="sy1">==</span> <a href="../../io/ios_base/fmtflags.html"><span class="kw1683">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">left</span></span></a></span></span> ，则将在后方填充
</dd><dd> 若 <span class="t-c"><span class="mw-geshi cpp source-cpp">adjustfield <span class="sy1">==</span> <a href="../../io/ios_base/fmtflags.html"><span class="kw1684">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">right</span></span></a></span></span> ，则将在前方填充
</dd><dd> 若 <span class="t-c"><span class="mw-geshi cpp source-cpp">adjustfield <span class="sy1">==</span> <a href="../../io/ios_base/fmtflags.html"><span class="kw1685">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">internal</span></span></a></span></span> 且表示中出现符号字符，则将在符号后填充
</dd><dd> 若 <span class="t-c"><span class="mw-geshi cpp source-cpp">adjustfield <span class="sy1">==</span> <a href="../../io/ios_base/fmtflags.html"><span class="kw1685">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">internal</span></span></a></span></span> 而阶段 1 表示以 0x 或 0X 开始，则将在 x 或 X 后填充
</dd><dd> 否则，将在前方填充
</dd></dl>
<ul><li> 若 <span class="t-c"><span class="mw-geshi cpp source-cpp">str.<span class="me1">width</span><span class="br0">(</span><span class="br0">)</span></span></span> 非零（例如刚使用了 <span class="t-lc"><a href="../../io/manip/setw.html" title="cpp/io/manip/setw">std::setw</a></span> ）且阶段 2 后的 CharT 数小于 <span class="t-c"><span class="mw-geshi cpp source-cpp">str.<span class="me1">width</span><span class="br0">(</span><span class="br0">)</span></span></span> ，则插入 <span class="t-c"><span class="mw-geshi cpp source-cpp">fill</span></span> 字符的副本于填充所指示的位置，令序列长度达到 <span class="t-c"><span class="mw-geshi cpp source-cpp">str.<span class="me1">width</span><span class="br0">(</span><span class="br0">)</span></span></span> 。
</li></ul>
<p>任何情况下，都调用 <span class="t-c"><span class="mw-geshi cpp source-cpp">str.<span class="me1">width</span><span class="br0">(</span><span class="nu0">0</span><span class="br0">)</span></span></span> 以取消 <span class="t-lc"><a href="../../io/manip/setw.html" title="cpp/io/manip/setw">std::setw</a></span> 的效果。
</p>
<h4><span class="mw-headline" id=".E9.98.B6.E6.AE.B5_4_.EF.BC.9A.E8.BE.93.E5.87.BA">阶段 4 ：输出</span></h4>
<p>如同用 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>out<span class="sy2">++</span> <span class="sy1">=</span> c</span></span> 输出来自阶段 3 的 CharT 序列的每个相继字符 <code>c</code> 。
</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
<table class="t-par-begin">


<tr class="t-par">
<td>  out
</td>
<td> -
</td>
<td> 指向首个要写入字符的迭代器
</td></tr>
<tr class="t-par">
<td>  str
</td>
<td> -
</td>
<td> 取得格式化信息来源的流
</td></tr>
<tr class="t-par">
<td>  fill
</td>
<td> -
</td>
<td> 需要填充结果到域宽时使用的填充字符
</td></tr>
<tr class="t-par">
<td>  v
</td>
<td> -
</td>
<td> 转换为字符串并输出的值
</td></tr></table>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
<p><code>out</code>
</p>
<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">注解</span></h3>
<p>转换说明 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="co2">#o</span></span></span> （例如产生自 <span class="t-lc"><a href="../../io/manip/showbase.html" title="cpp/io/manip/showbase">std::showbase</a></span> 和 <span class="t-lc"><a href="../../io/manip/hex.html" title="cpp/io/manip/hex">std::oct</a></span> 的组合）不计为填充字符。
</p>
 <table class="t-rev-begin">
<tr class="t-rev t-since-cxx11"><td>
<p>格式化浮点值为 hexfloat 时（即 <span class="t-c"><span class="mw-geshi cpp source-cpp">floatfield <span class="sy1">==</span> <span class="br0">(</span><a href="../../io/ios_base/fmtflags.html"><span class="kw1688">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">fixed</span></span></a> <span class="sy3">|</span> <a href="../../io/ios_base/fmtflags.html"><span class="kw1687">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">scientific</span></span></a><span class="br0">)</span></span></span> 时），不使用流的精度；而是始终以足以准确表示值的精度打印该数。
</p>
</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td></tr>
</table>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
<div class="t-example"><p>用平面直接输出数，并演示用户定义的平面</p><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">运行此代码</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;locale&gt;</span>
 
<span class="co1">// 此定制 num_put 平面输出所有整数类型的平方（除了 long long ）</span>
<span class="kw1">struct</span> squaring_num_put <span class="sy4">:</span> <a href="../num_put.html"><span class="kw1958">std::<span class="me2">num_put</span></span></a><span class="sy1">&lt;</span><span class="kw4">char</span><span class="sy1">&gt;</span> <span class="br0">{</span>
    iter_type do_put<span class="br0">(</span>iter_type s, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> f,
                     char_type fill, <span class="kw4">long</span> v<span class="br0">)</span> <span class="kw4">const</span>
    <span class="br0">{</span>
        <span class="kw1">return</span> <a href="../num_put.html"><span class="kw1958">std::<span class="me2">num_put</span></span></a><span class="sy1">&lt;</span><span class="kw4">char</span><span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">do_put</span><span class="br0">(</span>s, f, fill, v<span class="sy2">*</span>v <span class="br0">)</span><span class="sy4">;</span>
    <span class="br0">}</span>
 
    iter_type do_put<span class="br0">(</span>iter_type s, <a href="../../io/ios_base.html"><span class="kw1669">std::<span class="me2">ios_base</span></span></a><span class="sy3">&amp;</span> f,
                     char_type fill, <span class="kw4">unsigned</span> <span class="kw4">long</span> v<span class="br0">)</span> <span class="kw4">const</span>
    <span class="br0">{</span>
        <span class="kw1">return</span> <a href="../num_put.html"><span class="kw1958">std::<span class="me2">num_put</span></span></a><span class="sy1">&lt;</span><span class="kw4">char</span><span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">do_put</span><span class="br0">(</span>s, f, fill, v<span class="sy2">*</span>v<span class="br0">)</span><span class="sy4">;</span>
    <span class="br0">}</span>
<span class="br0">}</span><span class="sy4">;</span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
    <span class="kw4">auto</span><span class="sy3">&amp;</span> facet <span class="sy1">=</span> <a href="../use_facet.html"><span class="kw1897">std::<span class="me2">use_facet</span></span></a><span class="sy1">&lt;</span><a href="../num_put.html"><span class="kw1958">std::<span class="me2">num_put</span></span></a><span class="sy1">&lt;</span><span class="kw4">char</span><span class="sy1">&gt;&gt;</span><span class="br0">(</span><a href="../locale.html"><span class="kw1894">std::<span class="me2">locale</span></span></a><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
    facet.<span class="me1">put</span><span class="br0">(</span><a href="../../io/cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a>, <a href="../../io/cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a>, <span class="st0">'0'</span>, <span class="nu16">2.71</span><span class="br0">)</span><span class="sy4">;</span>
    <a href="../../io/cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
 
    <a href="../../io/cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a>.<span class="me1">imbue</span><span class="br0">(</span><a href="../locale.html"><span class="kw1894">std::<span class="me2">locale</span></span></a><span class="br0">(</span><a href="../../io/cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a>.<span class="me1">getloc</span><span class="br0">(</span><span class="br0">)</span>, new squaring_num_put<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
    <a href="../../io/cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="nu0">6</span> <span class="sy1">&lt;&lt;</span> <span class="st0">' '</span> <span class="sy1">&lt;&lt;</span> <span class="sy2">-</span><span class="nu0">12</span> <span class="sy1">&lt;&lt;</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<p>输出：
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">2.71
36 144</pre></div></div> 
</div>
<div class="t-example"><p>用户定义类型的 <span class="t-lc">operator&lt;&lt;</span> 的实现。</p><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">运行此代码</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;iterator&gt;</span>
<span class="co2">#include &lt;locale&gt;</span>
 
<span class="kw1">struct</span> base <span class="br0">{</span> <span class="kw4">long</span> x <span class="sy1">=</span> <span class="nu0">10</span><span class="sy4">;</span> <span class="br0">}</span><span class="sy4">;</span>
 
<span class="kw1">template</span> <span class="sy1">&lt;</span><span class="kw1">class</span> CharT, <span class="kw1">class</span> Traits<span class="sy1">&gt;</span>
<a href="../../io/basic_ostream.html"><span class="kw1715">std::<span class="me2">basic_ostream</span></span></a><span class="sy1">&lt;</span>CharT, Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span>
    operator<span class="sy1">&lt;&lt;</span> <span class="br0">(</span><a href="../../io/basic_ostream.html"><span class="kw1715">std::<span class="me2">basic_ostream</span></span></a><span class="sy1">&lt;</span>CharT, Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> os, base <span class="kw4">const</span><span class="sy3">&amp;</span> b<span class="br0">)</span>
<span class="br0">{</span>
    <span class="kw1">try</span> <span class="br0">{</span>
        <span class="kw1">typename</span> <a href="../../io/basic_ostream.html"><span class="kw1715">std::<span class="me2">basic_ostream</span></span></a><span class="sy1">&lt;</span>CharT, Traits<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">sentry</span> s<span class="br0">(</span>os<span class="br0">)</span><span class="sy4">;</span>
        <span class="kw1">if</span> <span class="br0">(</span>s<span class="br0">)</span>
        <span class="br0">{</span>
            <a href="../../iterator/ostreambuf_iterator.html"><span class="kw671">std::<span class="me2">ostreambuf_iterator</span></span></a><span class="sy1">&lt;</span>CharT, Traits<span class="sy1">&gt;</span> it<span class="br0">(</span>os<span class="br0">)</span><span class="sy4">;</span>
            <a href="../use_facet.html"><span class="kw1897">std::<span class="me2">use_facet</span></span></a><span class="sy1">&lt;</span><a href="../num_put.html"><span class="kw1958">std::<span class="me2">num_put</span></span></a><span class="sy1">&lt;</span>CharT<span class="sy1">&gt;&gt;</span><span class="br0">(</span>os.<span class="me1">getloc</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span>
                .<span class="me1">put</span><span class="br0">(</span>it, os, os.<span class="me1">fill</span><span class="br0">(</span><span class="br0">)</span>, b.<span class="me1">x</span><span class="br0">)</span><span class="sy4">;</span>
        <span class="br0">}</span>
    <span class="br0">}</span> <span class="kw1">catch</span> <span class="br0">(</span>...<span class="br0">)</span> <span class="br0">{</span>
        <span class="co1">// 设置 os 上的 badbit ，而且若要求则重抛出</span>
    <span class="br0">}</span>
    <span class="kw1">return</span> os<span class="sy4">;</span>
<span class="br0">}</span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
    base b<span class="sy4">;</span>
 
    <a href="../../io/cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> b<span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<p>输出：
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">10</pre></div></div> 
</div>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="../../io/basic_ostream/operator_ltlt.html" title="cpp/io/basic ostream/operator ltlt"> <span class="t-lines"><span>operator&lt;&lt;</span></span></a></div></div>
</td>
<td>  插入带格式数据 <br> <span class="t-mark">(<code>std::basic_ostream&lt;CharT,Traits&gt;</code> 的公开成员函数)</span> </td></tr>
</table>

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